Correlation between Treatment Planning Parameters and PSQA Results for Two Quality Assurance Devices
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Many institutions still perform patient-specific quality assurance (PSQA) using 2D array devices. However, no re- ports in the literature thus far have compared the correlations between PSQA results and treatment planning parameters to evaluate the impact of QA on IMRT. The purpose of this study is to compare the results of PSQA between MapCHECK and Octavius for radiation therapy. A total of 50 patients with passing PSQA results were included. The analysis threshold was set at 10% of the global maximum. Point dose differences were within the acceptable range of ±5% for all measurements. Gamma passing rates (GPRs) based on 3%/3 mm, 2%/2 mm, and 1%/1 mm were analyzed for all measurements. Correlations between treatment plan parameters and PSQA results were analyzed using Pearson’s correlation, to investigate the impacts of the PSQA results among all of the clinical cases. Plan complexity was evaluated to analyze the dosimetric accuracy by quantifying the degree of modulation according to each plan. A paired two-tailed Student’s t-test was performed to calculate the p-value using R software. The average difference in GPRs between the two detectors was statistically significant—except in the H&N, rectum, and breast cases with 3%/3 mm criteria. There were no significant correlations found between the modulation index and GPR results in any of the cases. These PSQA systems can be used interchangeably for routine PSQA during the delivery of radiation therapy
Abstract
Many institutions still perform patient-specific quality assurance (PSQA) using 2D array devices. However, no re- ports in the literature thus far have compared the correlations between PSQA results and treatment planning parameters to evaluate the impact of QA on IMRT. The purpose of this study is to compare the results of PSQA between MapCHECK and Octavius for radiation therapy. A total of 50 patients with passing PSQA results were included. The analysis threshold was set at 10% of the global maximum. Point dose differences were within the acceptable range of ±5% for all measurements. Gamma passing rates (GPRs) based on 3%/3 mm, 2%/2 mm, and 1%/1 mm were analyzed for all measurements. Correlations between treatment plan parameters and PSQA results were analyzed using Pearson’s correlation, to investigate the impacts of the PSQA results among all of the clinical cases. Plan complexity was evaluated to analyze the dosimetric accuracy by quantifying the degree of modulation according to each plan. A paired two-tailed Student’s t-test was performed to calculate the p-value using R software. The average difference in GPRs between the two detectors was statistically significant—except in the H&N, rectum, and breast cases with 3%/3 mm criteria. There were no significant correlations found between the modulation index and GPR results in any of the cases. These PSQA systems can be used interchangeably for routine PSQA during the delivery of radiation therapy